Why did Charles I’s execution cause hostility across Europe?

The execution of Charles I on January 30, 1649, caused widespread hostility across Europe primarily because it represented a direct assault on the divine right of kings. This political doctrine, which was widely accepted by European monarchs at the time, asserted that a king’s authority was derived directly from God and that he could not be held accountable by any earthly power, such as a parliament.1

By charging the king with high treason and executing him as a "tyrant, traitor, murderer, and public enemy," the English Parliament challenged the sacred nature of monarchy itself. Because the king’s person and authority were viewed as divinely ordained and absolute, the act of trying and beheading a sovereign was seen as a dangerous and radical subversion of the established order. This event shocked contemporary European rulers, who viewed the trial and execution not merely as a domestic political shift, but as a fundamental violation of the principles governing church and state, threatening the legitimacy of monarchical rule throughout the continent.231